// Integration tests for file upload functionality
// These tests focus on the overall system behavior

#[tokio::test]
async fn test_file_hash_calculation() {
    // Test the hash calculation utility directly
    use sha2::{Digest, Sha256};

    let content1 = b"test content for hashing";
    let content2 = b"different content";

    let mut hasher1 = Sha256::new();
    hasher1.update(content1);
    let hash1 = format!("{:x}", hasher1.finalize());

    let mut hasher2 = Sha256::new();
    hasher2.update(content2);
    let hash2 = format!("{:x}", hasher2.finalize());

    let mut hasher1_again = Sha256::new();
    hasher1_again.update(content1);
    let hash1_again = format!("{:x}", hasher1_again.finalize());

    // Hashes should be different for different content
    assert_ne!(hash1, hash2);

    // Hashes should be same for same content
    assert_eq!(hash1, hash1_again);

    // Hash should be 32 characters (MD5 hex)
    assert_eq!(hash1.len(), 32);
    assert_eq!(hash2.len(), 32);
}

#[tokio::test]
async fn test_multipart_boundary_parsing() {
    // Test multipart boundary parsing logic
    let boundary = "------------------------testboundary";
    let content_type = format!("multipart/form-data; boundary={}", boundary);

    assert!(content_type.contains("multipart/form-data"));
    assert!(content_type.contains(boundary));

    // Extract boundary from content-type header
    if let Some(boundary_part) = content_type.split("boundary=").nth(1) {
        let extracted_boundary = boundary_part.trim();
        assert_eq!(extracted_boundary, boundary);
    } else {
        panic!("Boundary not found in content-type header");
    }
}

#[tokio::test]
async fn test_file_size_validation() {
    // Test file size validation logic
    let small_content = vec![0u8; 1024]; // 1KB
    let medium_content = vec![0u8; 1024 * 1024]; // 1MB
    let large_content = vec![0u8; 100 * 1024 * 1024]; // 100MB

    // Simulate max file size limit (e.g., 50MB)
    let max_file_size = 50 * 1024 * 1024;

    assert!(small_content.len() <= max_file_size);
    assert!(medium_content.len() <= max_file_size);
    assert!(large_content.len() > max_file_size);
}

#[tokio::test]
async fn test_filename_validation() {
    // Test filename validation logic
    let valid_filenames = vec![
        "document.txt",
        "data.csv",
        "image.png",
        "archive.zip",
        "file-with-dashes.pdf",
        "file_with_underscores.docx",
    ];

    let invalid_filenames = vec![
        "",                             // empty
        "file/with/slashes.txt",        // path traversal
        "file\\with\\backslashes.exe",  // path traversal
        "file:with:colons.doc",         // invalid characters
        "file*with*asterisks.pdf",      // invalid characters
        "file?with?question?marks.txt", // invalid characters
        "file|with|pipes.doc",          // invalid characters
        "file\"with\"quotes.pdf",       // invalid characters
        "file<with>brackets.txt",       // invalid characters
        "con",                          // reserved Windows filename
        "prn",                          // reserved Windows filename
        "aux",                          // reserved Windows filename
    ];

    for filename in valid_filenames {
        assert!(!filename.is_empty());
        assert!(!filename.contains('/'));
        assert!(!filename.contains('\\'));
        assert!(!filename.contains(".."));
    }

    for filename in invalid_filenames {
        if !filename.is_empty() {
            // Check for common invalid patterns
            let has_invalid_chars =
                filename.contains(['/', '\\', ':', '*', '?', '"', '<', '>', '|']);
            let is_reserved = matches!(
                filename.to_lowercase().as_str(),
                "con"
                    | "prn"
                    | "aux"
                    | "nul"
                    | "com1"
                    | "com2"
                    | "com3"
                    | "com4"
                    | "com5"
                    | "com6"
                    | "com7"
                    | "com8"
                    | "com9"
                    | "lpt1"
                    | "lpt2"
                    | "lpt3"
                    | "lpt4"
                    | "lpt5"
                    | "lpt6"
                    | "lpt7"
                    | "lpt8"
                    | "lpt9"
            );

            assert!(has_invalid_chars || is_reserved || filename.contains(".."));
        }
    }
}

#[tokio::test]
async fn test_metadata_extraction() {
    // Test metadata extraction from multipart form
    use std::collections::HashMap;

    let mut metadata = HashMap::new();
    metadata.insert("project".to_string(), "test_project".to_string());
    metadata.insert("description".to_string(), "Test file upload".to_string());
    metadata.insert("source".to_string(), "integration_test".to_string());
    metadata.insert("parent_id".to_string(), "123".to_string());

    // Test metadata validation
    assert!(metadata.contains_key("project"));
    assert!(metadata.contains_key("description"));
    assert!(metadata.contains_key("source"));

    // Test parent_id parsing
    if let Some(parent_id_str) = metadata.get("parent_id") {
        let parent_id: Result<i64, _> = parent_id_str.parse();
        assert!(parent_id.is_ok());
        assert_eq!(parent_id.unwrap(), 123);
    }

    // Test optional fields
    let optional_fields = vec!["description", "source", "parent_id"];
    for field in optional_fields {
        assert!(metadata.contains_key(field));
    }
}

#[tokio::test]
async fn test_error_response_format() {
    // Test error response format consistency
    use serde_json::json;

    let error_response = json!({
        "detail": "No files provided"
    });

    assert!(error_response["detail"].is_string());
    assert_eq!(error_response["detail"], "No files provided");
}

#[tokio::test]
async fn test_success_response_format() {
    // Test success response format consistency
    use serde_json::json;

    let success_response = json!({
        "message": "Files uploaded successfully",
        "uploaded_items": 2,
        "items": [
            {
                "id": 1,
                "name": "file1.txt",
                "file_size": 1024,
                "is_public": true
            },
            {
                "id": 2,
                "name": "file2.txt",
                "file_size": 2048,
                "is_public": true
            }
        ]
    });

    assert_eq!(success_response["message"], "Files uploaded successfully");
    assert_eq!(success_response["uploaded_items"], 2);
    assert!(success_response["items"].is_array());
    assert_eq!(success_response["items"].as_array().unwrap().len(), 2);
}

#[tokio::test]
async fn test_temporary_file_operations() {
    // Test temporary file operations using tempfile
    use std::io::{Read, Write};
    use tempfile::NamedTempFile;

    // Create temporary file
    let mut temp_file = NamedTempFile::new().unwrap();
    let test_content = b"Temporary file test content";

    // Write to temporary file
    temp_file.write_all(test_content).unwrap();
    temp_file.flush().unwrap();

    // Read from temporary file
    let mut read_content = Vec::new();
    let mut file = temp_file.reopen().unwrap();
    file.read_to_end(&mut read_content).unwrap();

    assert_eq!(read_content, test_content);

    // Get file path
    let file_path = temp_file.path();
    assert!(file_path.exists());

    // File is automatically deleted when temp_file goes out of scope
}

#[tokio::test]
async fn test_content_type_detection() {
    // Test content type detection based on file extensions
    use std::collections::HashMap;

    let mut content_types = HashMap::new();
    content_types.insert("txt", "text/plain");
    content_types.insert("json", "application/json");
    content_types.insert("csv", "text/csv");
    content_types.insert("pdf", "application/pdf");
    content_types.insert("png", "image/png");
    content_types.insert("jpg", "image/jpeg");
    content_types.insert("jpeg", "image/jpeg");
    content_types.insert("gif", "image/gif");
    content_types.insert("zip", "application/zip");
    content_types.insert("doc", "application/msword");
    content_types.insert(
        "docx",
        "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
    );

    let test_files = vec![
        ("document.txt", "text/plain"),
        ("data.json", "application/json"),
        ("report.csv", "text/csv"),
        ("image.png", "image/png"),
        ("photo.jpg", "image/jpeg"),
        ("archive.zip", "application/zip"),
    ];

    for (filename, expected_type) in test_files {
        if let Some(extension) = filename.split('.').last() {
            if let Some(detected_type) = content_types.get(extension) {
                assert_eq!(detected_type, &expected_type);
            } else {
                // Default to binary if extension not found
                assert_eq!("application/octet-stream", expected_type);
            }
        }
    }
}

#[tokio::test]
async fn test_concurrent_file_processing() {
    // Test concurrent file processing simulation
    use tokio::task::JoinSet;

    let file_contents = vec![
        ("file1.txt", b"Content of file 1"),
        ("file2.txt", b"Content of file 2"),
        ("file3.txt", b"Content of file 3"),
        ("file4.txt", b"Content of file 4"),
        ("file5.txt", b"Content of file 5"),
    ];

    let mut join_set = JoinSet::new();

    // Simulate processing files concurrently
    for (filename, content) in file_contents {
        join_set.spawn(async move {
            // Simulate file processing time
            tokio::time::sleep(tokio::time::Duration::from_millis(10)).await;

            // Simulate hash calculation
            use sha2::{Digest, Sha256};
            let mut hasher = Sha256::new();
            hasher.update(content);
            let hash = format!("{:x}", hasher.finalize());

            (filename.to_string(), hash, content.len())
        });
    }

    let mut results = Vec::new();
    while let Some(result) = join_set.join_next().await {
        results.push(result.unwrap());
    }

    // Verify all files were processed
    assert_eq!(results.len(), 5);

    // Verify results are unique
    let mut hashes = std::collections::HashSet::new();
    for (_, hash, _) in &results {
        hashes.insert(hash);
    }
    assert_eq!(hashes.len(), 5); // All hashes should be unique
}
